Multi-fold panel assemblies

ABSTRACT

A closure assembly ( 40 ) of an opening in a building including at least two mutually pivoted panels ( 41, 42, 43 ) mounted with the mutual pivot axis ( 44 ) at least substantially vertical. The panels are movable between a closed condition whereby the at least two panels at least substantially in mutual alignment provide at least a partial closure of the opening in or substantially parallel to the plane of the opening, and an opened condition whereby the at least two panels, mutually disaligned by having pivoted mutually towards each other, are substantially clear of the plane of the opening. A proximate panel ( 41 ) is pivoted by a vertical pivot axis substantially in the plane of the opening at adjacent a vertical periphery of the opening ( 45 ). The distal region of distal panel ( 42 ) is supported by at least one supporting runner. The supporting runner is guided by a support track ( 51 ) which is skewed with respect to the plane of the opening and has the affect of spacing the supporting runner out of the plane of the opening at the vertical periphery.

FIELD OF THE INVENTION

The present invention relates to multi-fold window and/or doorassemblies.

In particular, the present invention is directed to a multi-foldarrangement adapted to lend itself to a more expansive openingconfiguration compared to alternative arrangements.

BACKGROUND OF THE INVENTION

Typical bifold assemblies as disclosed in our New Zealand PatentSpecification No. 336696, are capable of being folded or opened to theedge of the window or door opening. In such instances the folded windowsor door panels create an obstruction of sorts, be it visual orotherwise. Such prior art arrangements do not allow the entire wallopening to be fully utilised as they are constrained by hinges builtinto tracking arrangements. It would be an advantage for multi-foldpanel assemblies to have the prospect of clearing the opening of thepanels when in the opened condition. Our New Zealand PatentSpecification No. 505958 sought to achieve this outcome by releasing thedistal pivot axis from the tracks or track in the plane of the opening.The procedure of our New Zealand Patent Specification No. 505958 iseffective for the purpose but does require sturdy mounts as, in the openfolded condition against the building structure away from the opening,loadings of the panel pairs is carried through the sole remaining pivotaxis.

BRIEF DESCRIPTION OF THE INVENTION

It is an object of the present invention to more fully exploit the spaceprovided for by a wall opening for which a multifold window and/or doorassembly is intended.

The present invention is therefore directed to an arrangement, for atleast a bifold panel (glazed or otherwise) structure, and whether fordoor or window purposes or a hybrid of both, whether top or bottommounted (supported), which alone or in conjunction with a mirroredarrangement can provide an alternative to existing multifold panelsystems. As used therein and herein the term “plane of the opening”preferably includes a straight plane but may include a curved or othershaped opening and consequently the “plane of the opening” should beinterpreted as including any form of opening capable of being trackedsubstantially to the shape of the opening.

Where reference herein is made to the “mutual disalignment” of panels itis meant a positioning of the panels in a non co-planar condition. Suchmutual disalignment is preferably in the form of a concertina likecondition where the at least two panels are in a substantially overlyingposition.

The present invention is directed to assemblies, methods and proceduresthat are capable of achieving a similar outcome as that of our NewZealand patent specification no. 505958 as far as allowing the panels tobe cleared from the opening of the structure when open or to at leastprovide the public with a useful choice.

In one aspect the present invention consists in a closure assembly of anopening of or in a building or like structure, said closure assemblyincluding at least two mutually pivoted panels (glazed or otherwise)mounted with the mutual pivot axis at least substantially vertical andso as to be movable between:

(i) a closed condition whereby said at least two panels at leastsubstantially in mutual alignment provide at least a partial closure ofsaid opening in or substantially parallel to the plane of the opening,and

(ii) an opened condition whereby said at least two panels, mutuallydisaligned by having pivoted mutually towards each other, aresubstantially clear of the plane of the opening and where one of each,or all of at least two panels, lie at an acute angle or parallel withrespect to the plane of the opening,

wherein one of said panels (the “proximate panel”) is pivoted by an atleast substantially vertical pivot axis substantially in the plane ofthe opening at and/or adjacent a vertical periphery of said opening(“the proximal periphery”),

and wherein the distal region of the other panel (the “distal panel”) issupported by at least one supporting runner,

wherein the supporting runner running on a support track which, at leastin part is skewed, angled or angling, cranked or curved (hereafter“skewed”) with respect to the plane of said opening, has the affect ofspacing the supporting runner out of the plane of said opening at/oradjacent said proximal periphery.

Preferably the proximate panel is pivoted by a substantially verticalpivot axis fixed relative to said opening.

Preferably said proximate panel is pivoted by a substantially verticalpivot axis horizontally movable relative to and within the plane of theopening.

Preferably said supporting runner includes a wheeled bogie engaged withthe support track.

Preferably said support runner includes a vertical axis pivot to allowsaid wheeled bogie to pivot relative to said distal panel about avertical axis.

Preferably said vertical axis of said pivot of said wheeled bogie islocated at the mid thickness of said distal panel.

Preferably the support track is substantially rectilinear in form and isat an acute angle with respect to the plane of the opening.

Preferably the support track is at least in part rectilinear in form andsaid part is at an acute angle with respect to the plane of the opening.

Preferably the support track is rectilinear in form and parallel withthe plane of the opening (preferably in the plane of the opening) savefor that part thereof immediately proximal to the proximal periphery,where said track is angled to the plane of said opening to step thesupporting runner out of the plane of the opening.

Preferably the support track is curved.

Preferably the distal region of the distal panel is supported by onesupporting runner affixed at either the top or bottom (the “verticalsupported location”) of the distal panel.

Preferably the other of said top or bottom to said vertical supportedlocation is associated with a guiding runner tracked by a guiding trackin the plane or parallel to the plane of the opening, such guidingrunner nevertheless allowing by means of an extensile association of theguiding runner with the distal panel, movement for the distal panel infollowing the support track defined locus allowing the distal region ofthe distal panel to move as guided and pivoted with respect to theopening by the supporting runner guided by the support track.

Preferably the other of said top or bottom to said vertical supportedlocation is associated with a guiding runner tracked by a guiding trackin the plane or parallel to the plane of the opening, such guidingrunner including an extensile arm pivotally attached to the distalpanel, said extensile arm allowing the following of the support trackdefined locus required to allow the distal region of the distal panel tomove as constrained by said support track.

Preferably the guiding runner includes an articulation means extendingin a pivotal manner between the distal panel (at or towards the distalregion) said articulation means being further pivotally associated withsaid guiding track via a runner bogie located with and guided by theguiding track, thereby providing said extensile association.

Preferably said articulation means is a rigid arm.

Preferably said rigid arm extends perpendicular to said plane of saidopening when said panels are in said open condition.

Preferably the support runner is provided at the top of the distalpanel.

Preferably the guide runner is located at the bottom of the distalpanel.

Preferably the guide runner is provided at the top of the distal paneland the supporting runner is located at the bottom of the distal panel.

Preferably the distal region of the distal panel is supported by a topand bottom located supporting runner, each supporting runner running ina respective said support track, disposed at the top and bottom of theopening.

Preferably the proximal panel is pivoted by a fixed vertical pivot axisat the proximal periphery.

Preferably said panels in an open position, lie substantially parallelto the plane of the opening.

Preferably the closure assembly is fully framed.

Preferably the perimeter of said closure assembly is defined by a framestructure of a size commensurate to being received in said opening of orin said building or like structure.

Preferably the perimeter of said closure assembly is defined by a framestructure of a size commensurate to being received in said opening of orin said building or like structure said frame including a top frameextrusion, and a bottom frame extrusion parallel to said top frameextrusion and to extend horizontally in use, and two side frameextrusions affixed to and extending between said top and bottom frameextrusion and parallel to each other and to in use extend vertically.

Preferably said frame is at least in part an assembly of extruded forms.

Preferably said supporting runner is a top runner affixed to a top orupper part of said distal panel, and wherein said opening of or in saidbuilding includes head framing, said support track is incorporated in ahead assembly, said head assembly including

a) a longitudinally extending foundation member to be fastened to thehead framing of said opening with its longitudinal direction parallel tothe plane of said opening,

b) a subassembly carrying the support track, fastened to said foundationmember yet in a manner to allow the displacement of the said supporttrack in a manner selected from one or more of

-   -   (i) a linear manner to and from the bottom of said opening, and    -   (ii) a manner to allow the tilt of said track about a horizontal        axis parallel to the plane of said opening.

Preferably said supporting runner is a top runner affixed to a top orupper part of said distal panel, wherein said top frame member is a headassembly, said head assembly including

a) a longitudinally extending foundation member to be fastened to thebuilding and in a manner with its longitudinal direction parallel to theplane of said opening,

b) a subassembly carrying the support track, fastened to said foundationmember yet in a manner to allow the displacement of the said supporttrack in a manner selected from one or more of

-   -   (i) a linear manner to and from the foundation member, and    -   (ii) a manner to allow the tilt of said track about a horizontal        axis parallel to the plane of said opening.

Preferably said foundation member is fixed to said side frame members.

Preferably said subassembly is engaged to said foundation member by twoarrays of vertically extending adjustment screws, a first array and asecond array parallel to each other and to the plane of the opening,wherein the differential adjustment of the screws in one array to theother array inducing said tilt and wherein corresponding adjustment ofthe screws in the first array and the second array inducing the lineardisplacement.

Preferably said subassembly includes a pelmet with which said track isfastened and disposed therefrom in a manner to be exposed for engagementwith the supporting runner.

Preferably said pelmet extends outwardly from the plane of the openingsufficient to present from below thereof said support track and to allowthe spacing of the supporting runner to assume the opened condition.

Preferably said pelmet is an elongate substantially constant crosssection extruded member.

Preferably said pelmet includes trimming panels on each side of saidsupport track spanning the gap between said support track and thelongitudinal edges of said pelmet.

Preferably said first array of fastening screws is provided parallel toand on a first side of said plane of said opening and the second arrayis provided parallel to and on the other side of said plane of saidopening.

Preferably said screws of each array are equispaced.

Preferably a locking pin is provided fixed to said structure, saidlocking pin positioned to engage at distal region of said distal panelagainst an outwardly facing surface of said distal panel when saidpanels are at and proximate to its closed condition to capture frommoving outwardly.

Preferably a locking pin is provided fixed to said frame, said lockingpin positioned to engage at distal region of said distal panel againstan outwardly facing surface of said distal panel when said panels are atand proximate to its closed condition to capture said distal regionagainst a jam portion of said frame to thereby prevent said distalregion from moving outwardly.

Preferably said distal panel is supported at a top or bottom thereof bya said support runner and wherein at the other of said top or bottom thedistal region of said distal panel includes an outwardly facing surfaceand wherein a locking pin is provided fixed to said frame structure,said locking pin positioned to engage the outwardly facing surface ofsaid distal panel when said panels are at and proximate to its closedcondition to capture said distal region against a jam portion of saidframe to thereby prevent said distal region from moving outwardly.

Preferably said outwardly facing surface is a concealed to the outsidesurface of said distal panel.

Preferably provided to the proximal periphery disposed region of saidproximal panel on the to be distal panel facing side thereof when in theopened condition, is a first mutually attractive means, the distal panelbeing provided at a corresponding location to the location of said firstmutually attractive means on a proximal panel facing side thereof whenin the opened condition, with a second mutually attractive means tothereby allow the interaction of said mutually attractive means whensaid panels are in the opened condition to encourage said distal regionof said distal panel to remain engaged to the proximal peripherydisposed region of said proximal panel.

Preferably said first and second mutually attractive means aremagnetically-attractive means.

Preferably said first and second mutually attractive means are bothmagnets.

Preferably said first and second mutually attractive means arepositioned towards the bottom of said panels.

In a second aspect the present invention consists in a bifold doorand/or window structure

at least a proximal panel and a distal panel

wherein

(a) the distal panel is provided at/or adjacent a lower distal regionwith a pivot on an extension of or from a lower track runner tracked inthe plane of the opening to be closed by the door and/or window panelsand,

(b) the distal panel is provided at or adjacent an upper distal regionwith a means to provide pivot tracking from a support track of thestructure, said support track being skewed at least in part (whetherstraight, curved, kinked or otherwise)

and wherein together (a) and (b) have the affect of moving a thusdefined common distal pivot axis of the distal panel out of the plane ofthe opening as the panels are opening thereby to allow the bifold dooror window structure concertina back away from the opening with theproximal panel adjacent the building structure and the distal paneladjacent the proximal panel.

In a further aspect the present invention consists in a guiding runnerfor supporting a lower distal region of distal panel of a bifold ormulti-fold door and/or panel structure from a track, said guiding runnerhaving an arrangement adapted to pivotally attach to said distal regionof said distal panel,

a runner adapted to track said track, and

a link between the pivotal attachment and the runner, said linkincluding two substantially parallel pivot axes whereby the link canrange in its disposition from being aligned or substantially aligned inthe plane of the tracking locus or extend outwardly therefrom toeffectively space the pivot most proximal to the door and/or windowpanel from such plane of the tracking locus.

Preferably such a guiding runner is substantially as hereinafterdescribed with reference to any one or more of FIGS. 1B, 2, 3, 5, 6A-C,11, 12.

Preferably extrusions for framing an opening in a structure and forproviding tracks for such a structure, wherein in subassembly orassembly they are adapted to form part of an assembly or structure ofthe closure assembly as hereinbefore described.

In a further aspect the present invention consists in, in a buildingstructure, a pair of tracks at an opening for a bifold or the like panelassembly, the lower track being in the plane of the opening and theupper track being skewed outwardly of the plane of the opening.

In a further aspect the present invention consists in a bifold doorand/or window structure comprising

at least a proximal panel and a distal panel

wherein

(a) the distal panel is provided at/or adjacent a lower or upper distalregion with a pivot on an extension of or from a guiding track runnertracked in the plane of the opening to be closed by the door and/orwindow panels and,

(b) the distal panel is provided at or adjacent the other of said upperor lower distal region with a means to provide a pivot tracking from asupport track of the door or window structure, said support track beingskewed at least in part (whether straight, curved, kinked or otherwise)

and wherein together (a) and (b) have the affect of moving a thusdefined common distal pivot axis of the distal panel out of the plane ofthe opening as the panels are opening thereby to allow the bifold dooror window structure concertina back away from the opening with theproximal panel adjacent the building structure and the distal paneladjacent the proximal panel.

In a further aspect the present invention consists in a guiding runnerfor supporting a lower or upper distal region of distal panel of abifold or multi-fold door and/or panel structure from a track, saidguiding runner having an arrangement adapted to pivotally attach to saiddistal region of said distal panel,

a runner adapted to track said track, and

a link between the pivotal attachment and the runner, said linkincluding at least two substantially parallel pivot axes whereby thelink can range in its disposition from being aligned or substantiallyaligned in or acute to the plane of the tracking locus when said bifolddoor is closed or extend outwardly therefrom to effectively space thepivot most proximal to the door and/or window panel from such plane ofthe tracking locus.

Preferably such a guiding runner is substantially as hereinafterdescribed with reference to any one or more of FIGS. 1B, 2, 3, 5, 6A-C,11, 12.

Preferably extrusions for framing an opening in a structure and forproviding tracks for such a structure, wherein in subassembly orassembly they are adapted to form part of a closure assembly ashereinbefore described.

In a further aspect the present invention consists in, in a buildingstructure, a pair of tracks at an opening for a bifold or the like panelassembly, a first of said tracks positioned either as a lower or uppertrack and being in the plane of the opening and the second of saidtracks being opposite to the first of said tracks being skewed outwardlyof the plane of the opening.

In a further aspect the present invention consists in, in a buildingstructure, a pair of tracks at an opening or a bifold or the like panelassembly, the upper track being in the plane of the opening and thelower track being skewed outwardly of the plane of the opening.

Preferably said such track is of a kind capable of being used in aclosure assembly as hereinbefore described.

In a further aspect the present invention consists in a buildingincluding a closure assembly to an opening of said building, saidclosure assembly including at least two mutually pivoted panels (glazedor otherwise) mounted with the mutual pivot axis at least substantiallyvertical and so as to be movable between:

(i) a closed condition whereby said at least two panels at leastsubstantially in mutual alignment provide at least a partial closure ofsaid opening in or substantially parallel to the plane of the opening,and

(ii) an opened condition whereby said at least two panels, mutuallydisaligned by having pivoted mutually towards each other, aresubstantially clear of the plane of the opening and where one of each,or all of at least two panels, lie at an acute angle or parallel withrespect to the plane of the opening,

wherein one of said panels (the “proximate panel”) is pivoted by an atleast substantially vertical pivot axis substantially in the plane ofthe opening at and/or adjacent a vertical periphery of said opening(“the proximal periphery”),

and wherein the distal region of the other panel (the “distal panel”) issupported by at least one supporting runner,

wherein the supporting runner running on a support track which, at leastin part is skewed, angled or angling, cranked or curved (hereafter“skewed”) with respect to the plane of said opening, has the affect ofspacing the supporting runner out of the plane of said opening at/oradjacent said proximal periphery.

In still a further aspect the present invention consists in extrusionsfor framing an opening in a structure and for providing tracks for sucha structure, wherein in subassembly or assembly they are adapted to formpart of an assembly or structure of the present invention.

In still a further aspect the present invention consists in, in abuilding structure, a pair of tracks at an opening for a bifold or thelike panel assembly, a first of said tracks positioned either as a loweror upper track and being in the plane of the opening and the second ofsaid tracks being opposite to the first of said tracks being skewedoutwardly of the plane of the opening.

In still a further aspect the present invention consists in a buildingstructure, a pair of tracks at an opening or a bifold or the like panelassembly, the upper track being in the plane of the opening and thelower track being skewed outwardly of the plane of the opening.

Preferably said such track is of a kind capable of being used in anassembly of any of the kinds herein defined or described.

To those skilled in the art to which the invention relates, many changesin construction and widely differing embodiments and applications of theinvention will suggest themselves without departing from the scope ofthe invention as defined in the appended claims. The disclosures and thedescriptions herein are purely illustrative and are not intended to bein any sense limiting.

BRIEF DESCRIPTION OF THE DRAWINGS

Preferred forms of the present invention will now be described withreference to the accompanying drawings in which;

FIG. 1A illustrates an exterior view of a multi-fold panel assembly ofthe present invention in a simplified form,

FIG. 1B is a plan sectional elevation of a multi-fold door consisting oftwo panels together with a third panel hinged there of, in both the openand closed condition guided there between by utilising the skewed trackof the present invention,

FIG. 2 is a vertical cross-section elevation looking along line II ofFIG. 1, showing the multi-fold panel in a closed position showing thedetail of the top assembly and track therein and the bottom assemblywith the bottom bogie in its track,

FIG. 3 is a similar view to FIG. 2 taken looking along lines III of FIG.1 when the multi fold door is in the open condition,

FIG. 4 is a detailed view of the top extrusions with its skewed trackshown in FIG. 2,

FIG. 5 is a close up view of the bottom assembly and bogie as shown inFIG. 2,

FIG. 6A shows a side elevation of the bogie configured in this instancefor a bottom track,

FIG. 6B shows a top elevation of the same bogie in its fully extendedform, a position it would assume in FIG. 1 when the multi-fold panel isfully open,

FIG. 6C shows the same bogie as of 6B but as it would lie in the fullyclosed position as shown in FIG. 1 when the door is closed,

FIG. 7A illustrates a panel catcher and mounting nut shown in sideelevation,

FIG. 7B is a top elevation of 7A,

FIG. 8 is a vertical sectional view looking along a multi fold panelassembly analogues to FIG. 1 in region III of FIG. 1 but showing amagnetic or mutually attractive means used as an alternative for thebogie shown in FIG. 6,

FIG. 9 is a horizontal elevation of a rub strip shown in location inFIG. 5,

FIG. 10 depicts the multi-fold panel assembly in a similar view to thatof FIG. 1 within the addition of the top track and also the change inorientation of the bottom following assembly, but with a differentconfiguration of lower follower bogie assembly,

FIG. 11 shows a plan view close up of the closed door and theyorientation of the bottom runner and also the orientation of the toprunner and its orientation in the skewed top runner,

FIG. 12 shows a view similar to that of FIG. 11 however the second panel42 is in its last movement before closing and the bump strip 102 can beseen protecting the mohair seal 101 which partially protrudes past thehorizontal surface of the bump strip, and the approximate location ofthe retention pin 103 can also be seen,

FIGS. 13-16 show plan views of various configurations of panels, and

FIG. 17 shows a plan view of an alternative top rail form.

DETAILED DESCRIPTION OF THE INVENTION

When using a door consisting of multiple panels to close or partiallyclose a door way consideration needs to be given to the not inconsequential weight of such assemblies. The panels comprising the doorare often glazed and thus in conjunction with the panel frame can weigha significant amount. This weight poses more problems as the door isfolded out of cover of the opening. Support of one or more of the panelsby suspending from above or supporting from below can alleviate thisproblem. Such support can also guide the door in its opening andclosing. However to make the most of the space available the door needsalso to fold flat and to present minimal protrusion from the building,also preferably parallel with the building envelope, when opened.

The present invention utilises a modified guide track for example at thetop (or at the bottom) of the door frame, and extensile member linkedbottom (or top) tracked guide can allow the door to be sufficientlysupported and guided as well as folding clear out of the way of theopening.

As shown in FIG. 1A, a multi-fold panel assembly 40 consists of a firstpanel 41, a second panel 42 and optionally a third panel 43. The thirdpanel 43 is located from the distal end of the second panel 42 away fromthe first panel via a hinge 44B. The preferred arrangement of FIG. 1Awould be referred to as a three panel configuration. Otherconfigurations such as a 2 panel configuration where panels 41 and 42alone are provided are considered also. Other configures can beenvisaged such as a mirror image of panels 41 and 42 to the right ofpanel 43 opening away and to the right on a similar skewed track (a socalled three-two configuration). Other configurations such as a two-twoconfiguration (panels 41 and 42 fold away to the left hand side andmirror images of 41 and 42 folding away to the right hand side), andother such configurations of three, two and one panels are possiblealso. The first panel 41 may be hung off the surrounding frame 45 via ahinge 46, where subsequent panels are hung off the first and secondpanel via hinges 44A and 44B. Openings could also be spanned withmultiple sets of multi-fold panel assemblies, e.g. one assembly from theleft hand side and one from the right. Each hinge alternates on its'side of the door so that the assembly of the multi-fold panel may befolded in the concertina like manner. Depicted in the preferredembodiment of the present invention the centre section of each panel(41, 42 or 43) is glazed 49, though any means for filling the openingmay be used such as opaque or translucent materials, or solid materialsto form barriers or at least to partially close the opening.

Due to the weight of the panels that hangs on the hinge 46 a top runner50 is engaged on a top skewed rail 51 via four bearinged rollers 53which travel inside the top skewed rail 51 as shown in FIG. 2. The toprunner 50 is a supporting runner which is of a bogie like construction.The top runner provides vertical support the panels from the point ofengagement of the bogie with the panels independent from the top skewedrail 51. The skewed rail 51 is preferably of constant cross section. Therollers 53 and the vertical pivot 192 thereof are preferably positionedabout the mid thickness “X” of the panels.

The top rail 51 (preferably an extrusion) need not be angled over theentire travel distance to the opening, but rather may be parallel to theplane of opening and closing (55 and 54 respectively) for the majorityof its length and then move from the open plane 55 to the closed plane54 at the very last length of door travel. Such track need not bestraight or simply angled but may curve at a point along its length toallow folding of the door panels into opened plane 55 when opened. Forexample the track may be “s” shaped at its end of travel toward thefixed hinged end 68.

The assembly in vertical cross-section is shown in FIGS. 2 and 3, theexterior of the doorway being on the left hand side of the page. On FIG.1B the interior of the opening is on the upper portion and the exteriorof the opening is on the lower portion.

Assembled about the moving multi-fold panel assembly is a frameconsisting of lower extrusion 59 and upper assembly 66 associated witheach other via side frame members 70 and 71. The lower portion of theframe is defined by a lower extrusion 59 which in this embodiment has atrack 52 associated within it. However it may be a separate track isattached to the lower extrusion 59 whilst the lower extrusion ispreferred for the purposes of tracked support of the door panels, it isnot essential.

Accordingly the closure assembly of the present invention is a fullyframed item and can be handled as a unit for insertion into an openingof a building. The entire assembly can be positioned into the openingwithout the need for any additional at least structural componentsand/or hanging of doors subsequent to the engagement at the opening ofthe structure.

The upper assembly 66 consists of a foundation frame member 80, a pelmetextrusion 81 adjustably attached to the base extrusion via threadedfasteners 82 and a top skewed rail 51, with which the top runner 50 isengaged. The pelmet extrusion 81 preferably carries and preferably in afixed and secured condition, the top rail 51. The foundation extrusion80 is attached by penetrative fastenings 67 to the framing timbers 83(shown in phantom). The top skewed rail 51 is located on an angle withinthe pelmet frame 81 and has soffit members 84 and 85, roughly triangularshaped, to close off the void 86 of the pelmet extrusion, for aestheticpurposes.

An opening, such as that to be selectively closed by the presentinvention will normally have timber framing (such as 83) or the likedefining the opening. The framing of the opening provides a mount forthe multi fold panel assembly to be fastened to. In the preferredembodiment penetrative fastenings 67 (e.g. screws or nails) are usedthat pass through part of the surround comprised of upper assembly 66,vertical extrusions 70 and 71, and lower extrusion 59) of the multi foldpanel into the framing members, e.g. framing timbers 83 in this case.

At the hinged end 68 and the free end 69 of the multi-fold panelassembly, are vertical extrusions 70 and 71. The four extrusions (70,71, 59 and 80) are preferably pre-assembled together to provide asurrounding frame 45 in which the multi-fold panel assembly ispositioned and moves.

Fascia 72 (or reveals or liners, such as those made of wood) attach tothe periphery of the frame to provide in part a means to secure theframe to the building, and also provide an aesthetically appealinginterior finish. Rebates 193 in such fascia 72 may be provided toreceive an edge of interior wallboard lining.

It is desirable for such multi-fold panel assemblies when open (such asshown at the right hand side of FIG. 1) to lie each in its own planewhich is a plane parallel to that which they are in when closed (e.g.the plane of the opening). Further more this position should be out ofthe way of the opening of the frame which they are to close. Such aconcertina position allows fill access in and out of the doorway, has noprotruding panels or similar in which to catch or be walked into, andalso provides an aesthetically pleasing look to the door when opened.

When moving through from the closed position to the opening position (tolie folded against the exterior of the building) the panel to which thetop runner 50 is attached, the second panel 42 in FIG. 1, must trackfrom the plane 54 in which the door lies when closed rail extrusion tothe plane 55 in which the panel 42 substantially lies when open. Toachieve this the top skewed rail extrusion 51 in which the top runner 50is engaged must be on a skewed angle from the closed plane to the openplane, 54 and 55 respectively. Such an angle (87 in FIG. 1) will varydepending upon the width of the aperture to be opened (i.e. the width ofpanels 41 and 42) and thickness of the panels used which defines the outof plane 54 movement of the top runner by distance x to plane 55. Thenot inconsequential weight of part of the panels is supported and alsoguided throughout its movement by the track 51. The critical point ofits movement when most weight is applied as tension or the track 51 iswhen the panel 42 is at 90 degrees to the plane of the opening 54.

The skewed track need not be straight. It may only skew at a regiontowards or at the edge of the opening of the multi-fold panel (i.e.toward end 68), sufficient to allow the bogie on top runner 50 for panel42 to move out of the closed plane 54 to the open plane 55 so skewing ofthe support track need not be across the full extent of the scope of theclosed condition of the two panels but can be a partial skewing overonly part of the opening in that respect see for example FIG. 17.

The closed position of the panel 42 in cross section is shown in FIG. 2.The closed door second panel 42 lies in the closed plane 54. The closedand opened cross-sectional locations of the top skewed rail 51 are shownin FIGS. 2 and 3 respectively.

Upon opening, panels 41 and 42 break outwards (downwards in FIG. 1B) athinge point 44A. The panel 42 tracks along the top rail 51 from closedto open positions and vice versa. In moving from the closed plane 54 tothe open plane 55, the panel 42 comes to lie in or nearly parallel tothe opened plane position 55, and hence is rotated about hinge 46through 180 degrees.

For aesthetic purposes it is preferable not to have a skewed track inthe bottom extrusion 59 (although this can be done as an alternative orin addition) that forms the lower part of the overall frame in which themulti-fold panel opens and closes.

A lower track 52 of a different kind is however preferably provided forsecurity reasons and also to guide the panels about pivot 44B. The trackprevents in part, in the closed position, the door from being pulled offits hinges from below (for example by external force or wind pressure).It also holds the distal end of the distal panel 42 in it plane 55 whenin the open condition. Through the opening sequence the lower trackprovides a guide means and imparts rigidity to the opening of the doorin conjunction with the lower runner 88.

The lower runner 88 has the function once the door multi-fold panelshave been opened to hold the resulting folded assembly together andprevent at least the panel 42 from swinging outwardly at its bottomedge.

As the alternative to having a skewed track for the registering of thebottom of the panels with the frame, and in order to utilise a straighttrack 52 (i.e. parallel to the opened or closed planes) on the lowerframe 59, an extensile association is provided by articulation member 61which allows the pivotal engagement of a lower runner 62 (with rollers89) to travel in a straight line (parallel to the open and closedplanes) with the panel 42 as it moves out from plane 54 to its opencondition. FIG. 10 shows the movement of the lower runner 62 through theclosed, midway and fully open positions 62A, 62B and 62C respectively inrelation to the articulation arm 61 which moves from a position 61Asubstantially parallel to the closed plane 54 through an arc ofapproximately 90 degrees (through 61B) to lie at the position 61C. Inthe fully opened condition the arm preferably extends at 90 degrees tothe plane 54 as any movement to the panel with which the runner assembly88 is engaged e.g. as a result of wind loading, will be significantly ina direction at 90 degrees to such a plane. Accordingly if the arm 61extends parallel to such a direction, it is able to provide maximumrigidity to ensure holding of the panel. The more preferred form ofrunner assembly 88 as per FIG. 6 may not have the arm 61 move through 90degrees. This therefore allows the lower runner 88 to travel on a lowerstraight line parallel to the open and closed planes whilst allowing thepoint axially aligned with the top runner 50 to travel through theskewed path whilst still being connected to the lower runner 88.

The lower runner 88 consists of an articulation hinge 63 which allowsthe panel to which it is attached to rotate freely in relation to thearm 61 which is guided by the lower track 52. Pivotally attached to theswing arm 61 is an arm 64 on which are rollers 89 of a bogie likeassembly is provided. Preferably there are two rollers parallel alignedto travel on the lower track 52. Between the articulation hinge 63 andthe arm 64 and its pivot 90 is interposed the swing arm 61.

The top runner 50 consists of four bearinged rollers 110 which sit on abearing carriage 73, the bearing carriage being pivoted at a point 74for a 3 panel door (as shown) which is hinged via the body 75 which isinternally attached to the distant end of the distal panel (panel 42 inFIG. 1). The bearing carriage 73 can alternatively pivot at point 111for a 2 or 4 panel unit. The pivot happens at pivot point 111 for 2 and4 panel units so the gear does not (a), for a 2 panel bump into the jambextrusion 71 when closed and (b) in a four panel, bump into each otherwhere they meet at the middle of the door.

An alternative method of retaining at least panels 41 and 42 together(at the edges away from their respective hinged edges) for such similarpurposes is shown in FIG. 8 whereby mutually attractive means (forexample magnets but not limited thereto) are located on the inner faces91 and 92 of the panels 41 and 42. The mutually attractive means 93 and94 are at least located at facing positions of panels 41 and 42 when inthe open condition at or towards the bottom of the panels. Preferablysuch mutually attracted means are also provided on facing surfaces ofpanel 43 and 42 when in the open condition to allow for panel 43 to beretained securely in the open condition against panel 42 yet still beconveniently releasable therefrom when it is desired to move theassembly to a closed condition. Such mutually attractive means may beprovided either towards the top bottom or other location at the distalmost end of the panel 43 facing panel 42. However a mechanical fasteningmeans may also be provided for this purpose.

As part of the installation of the multi-fold panel assembly of thepresent invention in the configuration where the panels are supportedfrom above (as shown in the drawings) the foundation frame member 80 ofthe upper assembly 66 is mounted to the surrounding frame work of wood(or other materials) 83 by penetrative fasteners 67. These hold thefoundations frame member 80 fast and rigid to the surrounding framework. The sub frame 81 such as a pelmet is fastened to the foundationframe member 80 by means of threaded fasteners engagement screws 82.These are preferably spaced either side of the closure plane 54 atregular intervals spaced along the length of the span of the pelmet 80.For example in FIG. 1 these fasteners would run either side of the line54 between at least the hinge point 44B to the hinge point 46. Apertures97 in the soffit 84 and 85, allow for a tool to be passed through thesoffit to engage the fasteners 82 and turn them accordingly.Alternatively the soffit may be easily removable for access to begained. The engagement of the head of the fastener with the pelmet 81 orresulting assembly 98 allows the pelmet 81 to be adjusted both up anddown in the horizontal direction but also rotationally about an axishorizontal and parallel to the plane 54 to affect a rotational ofmovement of the pelmet frame in the resulting sub assembly relative tothe foundation frame member 80. Such adjustment allows the top skewedrail extrusion 51 to be adjusted in relation to the top runner 50 toensure that any sag of the upper assembly 26 is taken up so that the toprunner or runners 50 does not jam within the rail and is allowed to runsmoothly. Any such adjustment would be done after installation of theframe and multi-fold assembly once weight is exerted on the pelmet.Obviously as the pelmet 81 is moved the track 51 which is in integral(although preferably of a separate extrusion) with the pelmet 81 ismoved accordingly.

Towards the end of movement of the closed condition of the multi-foldpanel assembly the panel 42 and particularly the interior edge 99 of thedistal vertical edge of panel 42 (at top and/or bottom) is brought closeto and in many circumstances will hit the exterior facing rear edge 100of the bottom frame extrusion where a seal 101 is provided. Repeatedimpact of this type can damage both the panel and the frame extrusionand also the seal 101 (preferably of a mohair type seal) in thatvicinity. It is to be noted that such impact only occurs in the lastportion of closing travel of such panels as 42. Therefore a bumpextrusion 102 is provided, located in such a manner relative to the seal101 so that the edge 99 will strike the extrusion 102 and not impactupon the frame 100 or towards the base of the seal 101. Such a bumpextrusion may be replaceable and/or at least sacrificial for thispurpose. Materials for such extrusions may be of a plastics material orother such replaceable materials but which will not damage the coatingof panel 42.

A retention pin 103 is located on the lower frame at the position wherethe panel 42 is located in the closed condition to engage the lowerportions of the leading edge of the panel 42 such that when the panel isin an enclosed position the panel (or panels attached to) cannot swingout from the bottom frame. Such movement may occur under wind loading orby force applied to the bottom edge of the panel in the closed position.Thus when the panel is closed and locked it cannot be forced open ateither the top or the bottom of the frame. The retention pin 103 ismounted on mounting plates 104 and 105 respectively which are fastenedto the lower extrusion 59. A like pin may also be used to capture thepanel 41 against frame at closed condition.

Where panels are bottom guided and supported or both bottom and topsupported the pelmet arrangement can be reversed to be (or also be)provided at bottom. However adjustment need not be necessary at bottomsince no cantilevered support need be provided.

The lower runner 88 arrangement can in reversed circumstances, bepositioned at the top.

1. A closure assembly of an opening of or in a building or likestructure, said closure assembly including at least two mutually pivotedpanels (glazed or otherwise) mounted with the mutual pivot axis at leastsubstantially vertical and so as to be movable between: (i) a closedcondition whereby said at least two panels at least substantially inmutual alignment provide at least a partial closure of said opening inor substantially parallel to the plane of the opening, and (ii) anopened condition whereby said at least two panels, mutually disalignedby having pivoted mutually towards each other, are substantially clearof the plane of the opening and where one of each, or all of at leasttwo panels, lie at an acute angle or parallel with respect to the planeof the opening, wherein one of said panels (the “proximate panel”) ispivoted by an at least substantially vertical pivot axis substantiallyin the plane of the opening at and/or adjacent a vertical periphery ofsaid opening (“the proximal periphery”), and wherein the distal regionof the other panel (the “distal panel”) is supported by at least onesupporting runner, wherein the supporting runner running on a supporttrack which, at least in part is skewed, angled or angling, cranked orcurved (hereafter “skewed”) with respect to the plane of said opening,has the affect of spacing the supporting runner out of the plane of saidopening at/or adjacent said proximal periphery.
 2. A closure assembly asclaimed in claim 1 wherein the proximate panel is pivoted by asubstantially vertical pivot axis fixed relative to said opening.
 3. Aclosure assembly as claimed in claim 1 wherein said proximate panel ispivoted by a substantially vertical pivot axis horizontally movablerelative to and within the plane of the opening.
 4. A closure assemblyas claimed in claim 1 wherein said supporting runner includes a wheeledbogie engaged with the support track.
 5. A closure assembly as claimedin claim 1 wherein said support runner includes a vertical axis pivot toallow said wheeled bogie to pivot relative to said distal panel about avertical axis.
 6. A closure assembly as claimed in claim 5 wherein saidvertical axis of said pivot of said wheeled bogie is located at the midthickness of said distal panel.
 7. A closure assembly as claimed inclaim 1 wherein the support track is substantially rectilinear in formand is at an acute angle with respect to the plane of the opening.
 8. Aclosure assembly as claimed in claim 1 wherein the support track is atleast in part rectilinear in form and said part is at an acute anglewith respect to the plane of the opening.
 9. A closure assembly asclaimed in claim 1 wherein the support track is rectilinear in form andparallel with the plane of the opening (preferably in the plane of theopening) save for that part thereof immediately proximal to the proximalperiphery, where said track is angled to the plane of said opening tostep the supporting runner out of the plane of the opening.
 10. Aclosure assembly as claimed in claim 1 wherein the support track iscurved.
 11. A closure assembly as claimed in claim 1 wherein the distalregion of the distal panel is supported by one supporting runner affixedat either the top or bottom (the “vertical supported location”) of thedistal panel.
 12. A closure assembly as claimed in claim 11 wherein theother of said top or bottom to said vertical supported location isassociated with a guiding runner tracked by a guiding track in the planeor parallel to the plane of the opening, such guiding runnernevertheless allowing by means of an extensile association of theguiding runner with the distal panel, movement for the distal panel infollowing the support track defined locus allowing the distal region ofthe distal panel to move as guided and pivoted with respect to theopening by the supporting runner guided by the support track.
 13. Aclosure assembly as claimed in claim 11 wherein the other of said top orbottom to said vertical supported location is associated with a guidingrunner tracked by a guiding track in the plane or parallel to the planeof the opening, such guiding runner including an extensile arm pivotallyattached to the distal panel, said extensile arm allowing the followingof the support track defined locus required to allow the distal regionof the distal panel to move as constrained by said support track.
 14. Aclosure assembly as claimed in claim 12 wherein the guiding runnerincludes an articulation means extending in a pivotal manner between thedistal panel (at or towards the distal region) said articulation meansbeing further pivotally associated with said guiding track via a runnerbogie located with and guided by the guiding track, thereby providingsaid extensile association.
 15. A closure assembly as claimed in claim14 wherein said articulation means is a rigid arm.
 16. A closureassembly as claimed in claim 15 wherein said rigid arm extendsperpendicular to said plane of said opening when said panels are in saidopen condition.
 17. A closure assembly as claimed in claim 1 wherein thesupport runner is provided at the top of the distal panel.
 18. A closureassembly as claimed in claim 12 wherein the guide runner is located atthe bottom of the distal panel.
 19. A closure assembly as claimed inclaim 12 wherein the guide runner is provided at the top of the distalpanel and the supporting runner is located at the bottom of the distalpanel.
 20. A closure assembly as claimed in claim 1 wherein the distalregion of the distal panel is supported by a top and bottom locatedsupporting runner, each supporting runner running in a respective saidsupport track, disposed at the top and bottom of the opening.
 21. Aclosure assembly as claimed in claim 1 wherein the proximal panel ispivoted by a fixed vertical pivot axis at the proximal periphery.
 22. Aclosure assembly as claimed in claim 1 wherein said panels in an openposition, lie substantially parallel to the plane of the opening.
 23. Aclosure assembly as claimed in claim 1 wherein the closure assembly isfully framed.
 24. A closure assembly as claimed in claim 1 wherein theperimeter of said closure assembly is defined by a frame structure of asize commensurate to being received in said opening of or in saidbuilding or like structure.
 25. A closure assembly as claimed in claim 1wherein the perimeter of said closure assembly is defined by a framestructure of a size commensurate to being received in said opening of orin said building or like structure said frame including a top frameextrusion, and a bottom frame extrusion parallel to said top frameextrusion and to extend horizontally in use, and two side frameextrusions affixed to and extending between said top and bottom frameextrusion and parallel to each other and to in use extend vertically.26. A closure assembly as claimed in claim 23 wherein said frame is atleast in part an assembly of extruded forms.
 27. A closure assembly asclaimed in claim 1 wherein said supporting runner is a top runneraffixed to a top or upper part of said distal panel, and wherein saidopening of or in said building includes head framing, said support trackis incorporated in a head assembly, said head assembly including a) alongitudinally extending foundation member to be fastened to the headframing of said opening with its longitudinal direction parallel to theplane of said opening, b) a subassembly carrying the support track,fastened to said foundation member yet in a manner to allow thedisplacement of the said support track in a manner selected from one ormore of (i) a linear manner to and from the bottom of said opening, and(ii) a manner to allow the tilt of said track about a horizontal axisparallel to the plane of said opening.
 28. A closure assembly as claimedin claim 25 wherein said supporting runner is a top runner affixed to atop or upper part of said distal panel, wherein said top frame member isa head assembly, said head assembly including a) a longitudinallyextending foundation member to be fastened to the building and in amanner with its longitudinal direction parallel to the plane of saidopening, b) a subassembly carrying the support track, fastened to saidfoundation member yet in a manner to allow the displacement of the saidsupport track in a manner selected from one or more of (i) a linearmanner to and from the foundation member, and (ii) a manner to allow thetilt of said track about a horizontal axis parallel to the plane of saidopening.
 29. A closure assembly as claimed in claim 28 wherein saidfoundation member is fixed to said side frame members.
 30. A closureassembly as claimed in claim 28 wherein said subassembly is engaged tosaid foundation member by two arrays of vertically extending adjustmentscrews, a first array and a second array parallel to each other and tothe plane of the opening, wherein the differential adjustment of thescrews in one array to the other array inducing said tilt and whereincorresponding adjustment of the screws in the first array and the secondarray inducing the linear displacement.
 31. A closure assembly asclaimed in claim 28 wherein said subassembly includes a pelmet withwhich said track is fastened and disposed therefrom in a manner to beexposed for engagement with the supporting runner.
 32. A closureassembly as claimed in claim 31 wherein said pelmet extends outwardlyfrom the plane of the opening sufficient to present from below thereofsaid support track and to allow the spacing of the supporting runner toassume the opened condition.
 33. A closure assembly as claimed in claim31 wherein said pelmet is an elongate substantially constant crosssection extruded member.
 34. A closure assembly as claimed in claim 33wherein said pelmet includes trimming panels on each side of saidsupport track spanning the gap between said support track and thelongitudinal edges of said pelmet.
 35. A closure assembly as claimed inclaim 30 wherein said first array of fastening screws is providedparallel to and on a first side of said plane of said opening and thesecond array is provided parallel to and on the other side of said planeof said opening.
 36. A closure assembly as claimed in claim 30 whereinsaid screws of each array are equispaced.
 37. A closure assembly asclaimed in claim 1 wherein a locking pin is provided fixed to saidstructure, said locking pin positioned to engage at distal region ofsaid distal panel against an outwardly facing surface of said distalpanel when said panels are at and proximate to its closed condition tocapture from moving outwardly.
 38. A closure assembly as claimed inclaim 25 wherein a locking pin is provided fixed to said frame, saidlocking pin positioned to engage at distal region of said distal panelagainst an outwardly facing surface of said distal panel when saidpanels are at and proximate to its closed condition to capture saiddistal region against a jam portion of said frame to thereby preventsaid distal region from moving outwardly.
 39. A closure assembly asclaimed in claim 25 wherein said distal panel is supported at a top orbottom thereof by a said support runner and wherein at the other of saidtop or bottom the distal region of said distal panel includes anoutwardly facing surface and wherein a locking pin is provided fixed tosaid frame structure, said locking pin positioned to engage theoutwardly facing surface of said distal panel when said panels are atand proximate to its closed condition to capture said distal regionagainst a jam portion of said frame to thereby prevent said distalregion from moving outwardly.
 40. A closure assembly as claimed in claim38 wherein said outwardly facing surface is a concealed to the outsidesurface of said distal panel.
 41. A closure assembly as claimed in claim1 wherein provided to the proximal periphery disposed region of saidproximal panel on the to be distal panel facing side thereof when in theopened condition, is a first mutually attractive means, the distal panelbeing provided at a corresponding location to the location of said firstmutually attractive means on a proximal panel facing side thereof whenin the opened condition, with a second mutually attractive means tothereby allow the interaction of said mutually attractive means whensaid panels are in the opened condition to encourage said distal regionof said distal panel to remain engaged to the proximal peripherydisposed region of said proximal panel.
 42. A closure assembly asclaimed in claim 41 wherein said first and second mutually attractivemeans are magnetically attractive means.
 43. A closure assembly asclaimed in claim 41 wherein said first and second mutually attractivemeans are both magnets.
 44. A closure assembly as claimed in claim 41wherein said first and second mutually attractive means are positionedtowards the bottom of said panels.
 45. A bifold door and/or windowstructure at least a proximal panel and a distal panel wherein (a) thedistal panel is provided at/or adjacent a lower distal region with apivot on an extension of or from a lower track runner tracked in theplane of the opening to be closed by the door and/or window panels and,(b) the distal panel is provided at or adjacent an upper distal regionwith a means to provide pivot tracking from a support track of thestructure, said support track being skewed at least in part (whetherstraight, curved, kinked or otherwise) and wherein together (a) and (b)have the affect of moving a thus defined common distal pivot axis of thedistal panel out of the plane of the opening as the panels are openingthereby to allow the bifold door or window structure concertina backaway from the opening with the proximal panel adjacent the buildingstructure and the distal panel adjacent the proximal panel.
 46. Aguiding runner for supporting a lower distal region of distal panel of abifold or multi-fold door and/or panel structure from a track, saidguiding runner having an arrangement adapted to pivotally attach to saiddistal region of said distal panel, a runner adapted to track saidtrack, and a link between the pivotal attachment and the runner, saidlink including two substantially parallel pivot axes whereby the linkcan range in its disposition from being aligned or substantially alignedin the plane of the tracking locus or extend outwardly therefrom toeffectively space the pivot most proximal to the door and/or windowpanel from such plane of the tracking locus.
 47. A guiding runner asclaimed in claim 46 wherein such a guiding runner is substantially ashereinafter described with reference to any one or more of FIGS. 1B, 2,3, 5, 6A-C, 11,
 12. 48. Extrusions for framing an opening in a structureand for providing tracks for such a structure, wherein in subassembly orassembly they are adapted to form part of an assembly or structure ofthe closure assembly as claimed in claim
 1. 49. In a building structure,a pair of tracks at an opening for a bifold or the like panel assembly,the lower track being in the plane of the opening and the upper trackbeing skewed outwardly of the plane of the opening.
 50. A bifold doorand/or window structure comprising at least a proximal panel and adistal panel wherein (a) the distal panel is provided at/or adjacent alower or upper distal region with a pivot on an extension of or from aguiding track runner tracked in the plane of the opening to be closed bythe door and/or window panels and, (b) the distal panel is provided ator adjacent the other of said upper or lower distal region with a meansto provide a pivot tracking from a support track of the door or windowstructure, said support track being skewed at least in part (whetherstraight, curved, kinked or otherwise) and wherein together (a) and (b)have the affect of moving a thus defined common distal pivot axis of thedistal panel out of the plane of the opening as the panels are openingthereby to allow the bifold door or window structure concertina backaway from the opening with the proximal panel adjacent the buildingstructure and the distal panel adjacent the proximal panel.
 51. Aguiding runner for supporting a lower or upper distal region of distalpanel of a bifold or multi-fold door and/or panel structure from atrack, said guiding runner having an arrangement adapted to pivotallyattach to said distal region of said distal panel, a runner adapted totrack said track, and a link between the pivotal attachment and therunner, said link including at least two substantially parallel pivotaxes whereby the link can range in its disposition from being aligned orsubstantially aligned in or acute to the plane of the tracking locuswhen said bifold door is closed or extend outwardly therefrom toeffectively space the pivot most proximal to the door and/or windowpanel from such plane of the tracking locus.
 52. A guiding runner asclaimed in claim 51 wherein such a guiding runner is substantially ashereinafter described with reference to any one or more of FIGS. 1B, 2,3, 5, 6A-C, 11,
 12. 53. Extrusions for framing an opening in a structureand for providing tracks for such a structure, wherein in subassembly orassembly they are adapted to form part of a closure assembly as claimedin claim
 1. 54. In a building structure, a pair of tracks at an openingfor a bifold or the like panel assembly, a first of said trackspositioned either as a lower or upper track and being in the plane ofthe opening and the second of said tracks being opposite to the first ofsaid tracks being skewed outwardly of the plane of the opening.
 55. In abuilding structure, a pair of tracks at an opening or a bifold or thelike panel assembly, the upper track being in the plane of the openingand the lower track being skewed outwardly of the plane of the opening.56. A pair of tracks at an opening or a bifold or the like panelassembly, the upper track being in the plane of the opening and thelower track being skewed outwardly of the plane of the opening, whereinsaid such track is of a kind capable of being used in a closure assemblyas claimed in claim
 1. 57. A building including a closure assembly to anopening of said building, said closure assembly including at least twomutually pivoted panels (glazed or otherwise) mounted with the mutualpivot axis at least substantially vertical and so as to be movablebetween: (i) a closed condition whereby said at least two panels atleast substantially in mutual alignment provide at least a partialclosure of said opening in or substantially parallel to the plane of theopening, and (ii) an opened condition whereby said at least two panels,mutually disaligned by having pivoted mutually towards each other, aresubstantially clear of the plane of the opening and where one of each,or all of at least two panels, lie at an acute angle or parallel withrespect to the plane of the opening, wherein one of said panels (the“proximate panel”) is pivoted by an at least substantially verticalpivot axis substantially in the plane of the opening at and/or adjacenta vertical periphery of said opening (“the proximal periphery”), andwherein the distal region of the other panel (the “distal panel”) issupported by at least one supporting runner, wherein the supportingrunner running on a support track which, at least in part is skewed,angled or angling, cranked or curved (hereafter “skewed”) with respectto the plane of said opening, has the affect of spacing the supportingrunner out of the plane of said opening at/or adjacent said proximalperiphery.